Chain-wheel casing



(No Model.)

I G. L. MERRELL.

CHAIN WHEEL GASING.-

Patented Nov. 12, 1889.

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GAINS LfMERRELL, OF SYRACUSE, NIV YORK.

CHAIN-WHEEL CASING.

SPECIFICATION forming part of Letters Patent No. 414,774, dated November 12, 1889. A* .Y

Application filed J une `22 1889.

To @ZZ whom it may concern.-

Be it known that I, GAINS L. MERRELL, a citizen of the United States, residing at the city of Syracuse, in the county of Onondaga vand State of'New York, have invented a new and useful Improvement in Chai n-W h eel Casings, of which the followingis a specification.

This invention relates to a chain-wheel.' cas ing in which guides are employed forguiding the entering portion of the chain upon the sprocket-wheel and stripping the retreating portion of the chain from the sprocket-wheel,` thereby insuring the proper engagement of the chain with the wheel and its disengagement therefrom.

The invention consists of the improvements which will be hereinafter fullydesoribed, and pointed out in the claims.

In the accompanying drawings', Figure 1 represen ts a hoisting-tackle provided with my improved chain-wh eel @asin Fig. 2 is a per# spective view of the casing with thek front guides removed. Fig. 3 is a similar view of the front guides. Fig. 4 is a vertical section in line c 0c, Fig. l. view of the casing.

Like letters of reference referto like parts in the several figures.

A represents a sprocket-wheel, which is secured to the endof a shaft a, journaled in a hanger b. The latter depends from a traveling carriage B, mounted upon the track o.

D represents the rear plate of the wheelcasing, provided at its lower end with alug cl and with a hub or perforated boss d', in which the shaft arevolves. The Wheel A rests with its rear side against the boss d.

E represents the front plate arranged in front of the wheel A and connectedwith the rear plate by rearwardly-projectingI arms e e, which engage against opposite sides of =the lug d andare secured thereto by abolt f. The rear plate D is provided along its Aupright edges with forwardly-projecting flanges g g, which serve as external chain-guides. These guides are arranged adjacent to the outer sides of the entering and retreating portions of the chain, and are preferably made parallel with each other and connected at. their upper ends by an arch-shaped iiange g', which is arranged nearly concentric with the chainwheel. The lower ends of the outer guides n and chain.

Fig. 5 is a bottom plan.

serai No. 315,254. (No modem g gare slightly curved outwardly, so as to :facilitate the entrance of the chain. The ou'terguides g g, in conjunction with the connecting-arch and the rear plate, also serve as a case or hood to protect the sprocket-wheel The rear plate is provided on its inner side with two stripping guides h 7L, which are arranged parallel with the outer guides on opposite sides of the boss d'. The outer or stripping surface of each of these ribs begins inside of the pitch-line of the sprocket-wheel at the upper end of each guide and exten ds downward in a tangential line, so

that when the chain in engaging against thev outer surface of one'of these guides will be gradually stripped from the sprocket-s of the wheel in passing out of the wheel-easing. The ends of these inner rear guides are curved to facilitate the engagement of the chain with the outer surfaces thereof.

The front plate E is provided with two arms i if, which are arranged parallel with the inner rear guides h h, and project upwardly on both sides of the wheel-hub, .so as to operate as inner stripping-guides on the front side of the wheel, while the ribs h h operate as inner stripping-guides on the rear side of the wheel. The wheel-casing is mounted on the shaft and held thereon between the hanger and sprocketwheel against longitudinal movement.

The upper end of the rear plate D is provided with a socket-plate, which engages against opposite sides of the hanger by means of lugs 7s k, and thereby secures the pulleycasing against lateral displacement.

In new drive-chains the joints are sometimes very stitf and apt to 'ride over and rest on the sprockets of the wheel, which frequen tly causes them to be broken. The chain in approaching the sprocket-wheel is guided toward the same and caused to firmly engage therewith by one of the outergu/ides g, thereby IOO of the chain, which liberate the chain from the wheel, and consequently allow the latter to work with more freedom. Theiuner stripper-guides are arranged within the outer guides, whereby channels are formed between the outer and inner guides, through which the chain moves toward and from the wheel, and whereby the chain is securely guided in its movements.

Itis obvious that the front plate and its stripping-arms i z' might be dispensed with; but thisis notdesirable, it would cause the chain to wear unequally, owing to the stripper acting only on one side of the chain.

When the chain and wheel travel continually in one direction, only one of the outer guides g and one set of strippers are in operation, and the others could be dispensed with; but where the chain is intermittently reversed, as is usual in hoisting-tackles, it is desirable to have both outer guides and both sets of strippers, as shown.

I claim as my inventionl. The combination, with the chain-wheel, ot' a casing provided with outer chain-guides arranged outside the periphery of the wheel, and inner stripper-guides arranged within the outer guides and projecting with their inner ends within the periphery of thewhcel,

whereby channels are formed between the f outer and inner guides, through which the chain moves toward and from thewheel, subs-tantially as set forth.

2. The combination, with the chain-wheel, of a casing provided with outer chain-guides arranged outside of the periphery of the wheel, and inner stripper-guides projecting with their inner ends within the periphery of the wheel and composed of rear guides and front guides separated by a space through which the chain-wheel moves, substantially and the hanger and provided with lugs which embrace the sides of the hanger, substantially as set forth.

lVitness my hand this 13th day of June, 1889.

GAINS L. MERRELL.

Witnesses:

THEO. L. Porr, CARL F. GEYER.

lIt is hereby certified that the name of the patentee in Letters Patent No. 414,774,

' granted November 12, 1889, for an improvement in Chain-Wheel Casings, was

erroneously Written and printed Gains L. Merrelh?7 Whereas said name should have y been Written and printed Gaius L. Merrell,- and that said Letters Patent should be read with this correction therein that the same may conform to the record of the case lJorrectcn Ain Letters "Patent No.

in the Patent Office. Signed, eountersig'ned, and sealed this 10th day of December, A. D. 1889. n [SEAL] A GYRUS BUSSEY,

` Assistant Secretary of the Interior. Countersigned ,s Y

C. E. MrroHELL,

Commissioner of Patents. 

